Re: The speed of gravity revisited
- From: Tom Roberts <tjroberts137@xxxxxxxxxxxxx>
- Date: Fri, 07 Mar 2008 15:44:38 GMT
Albertito wrote:
There are evidences showing that in Solar system,
the speed of gravity is many orders of magnitude higher
than the speed of light.
Sure. But this is MODEL DEPENDENT. In the model of Newtonian gravitation, gravity propagates INSTANTLY (i.e. with infinite speed). In the model of GR, gravity does not propagate at all, but changes in gravity propagate with speed c. The GR model agrees with all these "evidences", and indeed it accounts MUCH more accurately than the Newtonian model for measurements in the solar system (including the perihelions of Mercury and other planets, the Shapiro time delay, the bending of EM radiation by the sun, the operation of the GPS, the frame dragging measured by the LAGEOS satellites, etc.).
Bottom line: it is MUCH better to discuss models and their agreement with experiments than to discuss MODEl-DEPENDENT quantities like "speed of gravity". That is, discuss science (experiments) rather than engineering (measurements), and avoid unacknowledged puns (such as model-dependent meanings of words that are treated as if they had a single meaning) like "speed of gravity".
[... further nonsense based on unrealistic models ("aetherists")...]
Tom Roberts
.
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